摘要
研究膨胀石墨对模拟海水中重油的吸附热力学行为。结果表明:在293~308 K,含油量为2.172~18.11 mg.dm-3实验浓度范围内,膨胀石墨对模拟海水中重油的吸附是放热过程,吸附等温线符合Freundlich和Langmuir方程。根据热力学函数关系计算出膨胀石墨对模拟海水中重油的标准吸附焓变为-39.49 kJ.mol-1,标准吉布斯自由能变为-22.40^-23.50kJ.mol-1,说明吸附过程可自发进行。
The thermodynamic sorption behavior and mechanism of expanded graphite for heavy oil in simulated seawater were investigated. Equilibrium data for the sorption within the temperature range of 288 K-308 K were obtained and correlated with Langmuir and Freundlich isotherm equations. The sorption constant and thermodynamic parameters were calculated. The enthalpy for the process is - 39.49 kJ. mol^- 1, which indieated that the sorption process is exothermic. The free energy was -22.40-- 23.51 kJ.mo1^-1, indicating that the sorption process is spontaneous.
出处
《中国海洋大学学报（自然科学版）》
CAS
CSCD
北大核心
2008年第1期103-106,共4页
Periodical of Ocean University of China
基金
国家自然科学基金项目(40676047)资助
关键词
膨胀石墨
重油
模拟海水
吸附热力学
expanded graphite
heavy oil
simulated seawater
sorption thermodynamics
